Diaphragm pump



June 27, 1933. J. G. c. MANTLE DIAPHRAGM PUMP Filed oct. 9, 1929 INVENTOR W C. mdf@ 6MM V//WL/fL ATTORNEY 5` Patented June 27, 1933 UNITED STATES JOSEPH G. 0. MANTLE, OF LEONIA, NEW JERSEY DIAPHRAGH PUMP Application led October 9, 1929. Serial No. 398,282.

This invention relates to diaphragmV pumps of the kind which are operated by a fluid of pulsating pressure and in whlch, al-

the liquid being pumped, both thereinto and from, ceases whenever the pressure yin the Huid in the pumping chamber exceeds a predetermined limit and is resumed, automaticall when the pressure is again within that limlt. One of the uses of such pumps is the supplying of liquid fuel to the carburetor of an internal combustion engine and where,

although the pump is continuously operated by a pulsating pressure of a fluid of the engine, both the induction and eduction of the liquid fuel ceases when the pressure in the pump is increased by the closure of the float valve of the carburetor, and is resumed when the float valve is vagain open. Hitherto, 1n pumps of this kind either the pulsatin pressure in the pulsating'luid was too igl1 a frequency or the pressure of too great an 1ntensity or too variable in intensity or frequency to successfully effect the eduction stroke of the diaphragm. In other words, such pumps have failed in durability and reliabillty.

In this pump of my invention, it is the greater of the pressures of the pulsating pressure which .effects the eduction stroke ofI the .dia-phragli; and there is an associated regulating means which, whenever the pressure limit inthe fluid being pumped is reached, automatically enlarges the pumping chamber. This enlargement prevents the eduction valve from opening and, although thediaphragm continues its pumping movements, yet both the induction and eduction valves remain closed, but they immediately open upon a slight decrease of pressure in the fluid. Any. desired head or pressure may be maintained withoutthe aid of any valve beyond its own eduction valve., Also in this pump there is no air pocket required in the pumping chamber and consequently its suction eliciency adapts it for all general purposes.

To the accomplishment of the foregoing and such other objects as may hereinafter appear, this invention relates to the construction, combination and arrangement of parts hereinafter described, and then sought to be defined in the appended claims, reference bethough continuously operated, the flow of ing had to the accompanying drawing forming a part hereof, and which show merely forA the purpose of illustrative disclosure the embodiments of my invention, it being expressly understood, however, that various changes may be made in practice within the scope of the claims without digressing from my inventive idea.

In the drawing- Figure 1 represents a vertical sectional View of one form of pump embodying my invention. y

Figure 2 is a vertical sectional view of the structure shown in Figure 1 taken substantially on line 2-2 thereof. Figure 3 is a View similar to Figure 1 of ano ther form of pump embodying my invention.

Figure 4 is another View similar to Figure 1 of another form of pump embodying my invention.

In each of the figures of the drawing, the

lcorresponding parts have been given the same reference characters.

The body portion of the pump is preferably composed of the two parts, 1 the upper partand 2 the lower part. The lower part 2 is provided with a passage'i which forms the inlet to the pumping diaphragm and this Numeral 5 is anlinduction valve controllingthe inlet '3, and 6 is an eduction valve controlling the' outlet 4. Numeral 7 designates the inlet communication to the pump, and 8 designates the outlet communication from the ump.

The pumping element of thisy device is in the form of a diaphragm 9 of general cylindrical shape. The numeral 10 designates another diaphragm which forms an expansible and contractible portion of the wall of the 1pumping chamber, and which, because of its function, is termed a pressure regulatin dia-A phragm. The pumping chamber is esignated by the reference character 11, and is actually the space bounded by the diaphragms 9' and 10 and the body portion 2. Numeral 12 designates a frame or part extending downwardly from thebody portion 2 and terminating in the horizontal part 13 whichv serves as a stop to limit the upward movement of the pressure regulating diaphragm 10' in the form of pump shown in Figures 1 and 2, and the downward movement of the regulating Adiaphragm 1() in. the form ot pump shown in Figures 3 and 4.

Numeral 14 designates a member which is screwed into the body portion 2 to hold the regulating diaphragm 10 in position by clamping its upper annular fiange 15 to the bod portion. The upper annular ange 16 of t e pumping diaphragm 9 is clamped between the body portions 1 and 2 of the pump, held together by screws 17. A

The body portion 1 of the pump of the forms shown in Figures 1, 2 and 3 are of such a form that, should the-fluid of pulsating pressure be a gaseous one of a nature or having a temperature injurious to the diaphragms, it may be filled to the level 18 with a suitable liquid, and is furnished with cooling ribs 19 and also with a flange 20 for attaching it to the source of pulsating pressure. Figure 4 shows a form which is adapted for operation by a fluid of pulsating pressure which is harmless to the diaphragm and therefore contacts with it. ln the form shown in Figures 1 and 2, the pulsating pressure acts on the inner surface of the pumpingdiaphragm, whilst in the forms shown in igures 3 and 4 it acts on the outer surface. ln cases where there is great pressure in the pulsating fluid the pumping diaphragm is backed by a suitable spring 22 with an intervening pressure-distributing plate 23. To provide against an excessive movement through an accidental abnormal pressure in the pulsating fluid the plate.23 and the upper portion of the sto 13, which supports the spring, are provi ed with stop surfaces 24 and 25. These surfaces do not come in contact during the normal working of the pump. rllhe holes 12 in the body portion 2 vent the u per portion of the outer annular portion o? the pumping chamber 11 by connecting that portion tothe upper portion of the mner annular portion and thus prevent an air pocket in the outer annular portion. Attention is directed to the flange of the diaphragm which forms the inner wall of the pumping chamber 11. rlhis flange is of dished form, and the portion, which extends downwardly, contacts with the bore of the body portion 2 till it reaches the inlet and outlet passages 3 and 4 of the pumping chamber. rlhe pur-- pose of this dished form of flange and of the holes 12 is to entirely prevent an a 1r pocket in the pumping chamber as an a1r pocket would greatly decrease its efficiency when pumping .a liquid by suct1on.

rlhe closed end 26 of the pressure regulataeraese ing diaphragm 10 is normally in contact with the stop 13 and balances the predetermined pressure in the fluid during the eduction strokes of the pumping diaphragm 9. An excess of pressure moves this closed end from the stop. The predetermined pressure' may be regarded as the equivalent and represented by the head of liquid extending from the eduction valve 6 to the level L in the receptacle 27. Figures 1 and 4 each shows a pump supplying liquid receptacle from which the liquid is flowing therefrom through an orifice 28 at the same rate as supplied by the pump and L represents the level of the liquid at the commencement of an eduction stroke of the pumping diaphragm 9. Now should, through any cause, by the end of the eduction stroke, the outflow through the orilice 28 be less than the supply to the receptacle 27, the level in the receptacle would have risen to L and the closed end 26 of the pressure-regulating ldiaphragm 10 will occupy the position 26, due to the increase in back pressure. So long as the level is L', both the induction valve 5 and the eduction valve 6 remain closed and the continuing induction and eduction strokes of the pumping diaphragm 9 are merely ineffectual strokes, for during each induction stroke the closed end 26 moves from 26 to 26-in the same direction as that of the pumping diaphragm 9-and the volume in thenpumping chamber remains unchanged; and, during each eduction stroke the closed end 26 moves from 26 to 26-in the same direction as that of the pumping diaphragm 9-and the volume in the pumping chamber remains unchanged.

lt is understood', however, that this pump is provided with means for determining and regu ating the pressure in the fluid which is separate and distinct from and in no way dependent upon the operating pressure which operates the pumping diaphragm to effect the eduction strokes. As a matter of fact, the operating pressure may be very great and yet the regulation of this pump is very responsive and exceedingly sensitive to a slight increase in the pressure in the fluid being pumped.

Having thus fully described the invention, what l claim as new and desire to secure by Letters Patent is:

1. ln a diaphragm pump operated by a fluid of pulsating pressure, the combination of a. housing provided with an inlet and an outlet, two corrugated diaphragms in said housing one serving as the pumping element of the pumping chamber and the other serving to regulate and limit the pressure in the fluid in the pumping chamber to a predetermined limit during the continuous and unceasing movementsof the said pumping elements, the. said diaphragm serving as the pumping element beingoperatedfby the pressure in the Huid of pulsating pressure.

2. In a diaphragm pump operated by a fluid of pulsating pressure, the combination of a housing provided with an inlet and anoutlet, a stop member therein, two diaphragms in said housing, one serving' as the pumping element of the pumping chamber and the other serving to regulate and limit the pressure in the fluid in the pumping chamber to a predetermined limit, the diaphragm serving as the pumpin `element being operated by the iluid of pu sating pressure and the diaphragm serving' to limit the pressure on the Huid in the pumping chamber being normally in contact with said stop member and moving away from'it whenever the pressure in the fluid in the pumping chamber exceeds that said limit and thereby stopping the flow of uid to and from the pumping chamber until the pressure is again within that limit.

3. In a diaphragm pump operated by pulsating fluid pressure, in combination, a casing having valve controlled iuid inlet and outlet, a air of spaced, nested diaphragms mounted in said casing and spaced apart to provide a pumping chamber therebetween, said pumping chamber being-,in connection with said inlet and said outlet, one of said diaphragms beingexposed to pulsating iuid pressure whereby under normal operation the ried in accordance with the pulsations, said second diaphragm being .subject to the iniluence of the pressure of the Huid being pumped and being adapted to be moved'by an increase in .the pressure of said fluid being pumped beyond a predetermined limit so as to initally increase the cubic content of the pumping chamber and prevent further pumping of the Huid until said pressure again falls below said predetermined limit.

4. In a diaphragm pump operated by pulsating liuid pressure, in combination, a casing having valve controlled fluid inlet and outlet, a pair of diaphragms mounted in said casing and spaced apart to'provide a pumping chamber therebetween, said pumping .chamber being in connection vwith said inlet and said outlet, one of said diaphragms being exposed to pulsating fluid ressure whereby under normal operation t e cubic content of the pumping chamber is varied in accordance with the ulsations, said second diaphragm being subJect to the influence of the pressure of the fluid being pumped and being adapted to be moved by an increase in the pressure of said Huid lbeing pumped beyond a predetermined limit so as to initially increase the cubic content of the pumping chamber and prevent further pum ing of the fiuid until said pressure again alls below said predetermined limit, and resilient means associated with said pumping diaphragm for opposing abnormal pulsating pressures.

5. In a diaphragm pump operated by pulsating fluid pressure, in combination, a

' ing diaphragm for cubic content of the pumping chamber is va casing having valve controlled fluid inlet and outlet, a pair of diaphragms mounted in said casing `and spaced apart toprovide a pumping chamber therebetween, said pumping chamberbeing in connection withsaid in et and said outlet, one of said diaphragms y being exposed `to pulsating Huid pressure whereby under normal operation the cubic content of the pumping chamber is varied in accordance with the ulsations, said second diaphragm being subject to the influence of the pressure of the fluid being pumped and being adapted to be moved by an increase in the pressure of said iuid being pumped beyond a predetermined limit so as to initially increase the cubic content of the pumping chamber and prevent further pumping of the fluid until said pressure again falls below said redetermined limit, and resilient means associated with said pumping diaphragm for opposing abnormal pulsating pressures, and a stop mechanism associated with said pumppreventing abnormal movement of the same.

6. A diaphragm pump comprising a housing provided with an inlet and an outlet, nested diaphragms thereinl :formingA a pumping chamber therebetween, a vframe between said diaphragms, one of said diaphragms being provided with a plate, and a spring between said frame and said plate, the spring acting as a cushion for said diaphragm.

7. A diaphragm pump comprising a housing provided with an inlet and an outlet, nested diaphragms therein forming a umping chamber, a frame, one of sai diaphragms being provided with a reinforcing late, a. spring between said plate and said rame, the spring acting as a cushion for said diaphragm provided with said plate and said framel forming a stop means for one of said diaphragms to prevent an excessive movement thereof.

8. A diaphragm pump comprising a hous- .l

ing provided with an inlet and an outlet,` nested diaphragms therein forming a pumping chamber, a Uframe in said housing between said diaphragms and havin a bottom portion, one of said diaphragms eingsprovided with a reinforcing plate, a s ring between said plate and said frame, uid pres,-

sure means for actuating one of said diaphragms, said frame acting to limit the movenents of said diaphragms.

- 9. In a diaphragm pump, a housing provided with an inlet and an outlet, expansible and contractible diaphragm therein and moving in opposite directions and serving asa pumping element, the said diaphragm being yieldably operated in both of'said directions, rigid stop means for limiting the amount of movement of said diaphragm in one direction, and another expansible and contractible diaphragm which is rigidly restrained from movement or yielding in one of the said directions by said stop means and is spring sustained and yieldable in the op posite direction said diaphragms cooperating to form a pumping chamber.

10. ln a diaphragm pump, a housing provided With an inlet and an outlet, a exible diaphragm therein and adapted to be moved in opposite directions to serve as a pumping element, means for yieldingly supporting said diaphragm so that the said diaphragm may be yieldably operated in both of said directions, rigid stop means for limiting the amount of movement of said diaphragm in one direction, a second flexible diaphragm, and means for yieldably supporting said second diaphragm in one of said directions, said rigid stop means also rigidly restraining the said second diaphragm. from movement in the opposite direction.

11. ln a pump of the character described, a housing having an inlet and an outlet, a plurality of eXpansible and contractible corrugated elements forming a pumping chamber in said housing, and means positioned between said elements for limiting the movements thereof, said means being in communication With said pumping chamber to preventthe accumulation of air in the pump.

12. A pump of the. character described,

inmensa .comprising a housing having4 an inlet an outlet, complementary diaphragms therein spaced to form a pumping chamber, Iand. means for separating said diaphragms and for limiting the movements thereof, said means being provided with an opening adjacent the top thereof for avoiding the formation of air pockets.

13. A pump of the character described,

comprising a housing having an inlet and an outlet, complementary corrugated diaphragms spaced to form a pumping chamber in said housing, and means for preventing the formation of air pockets in the pumpingchamber.

14. 1n a pump of the character described, `a housing provided with an inlet and an outlet, nested, spaced, corrugated expansible and contractible members, one of said members being adapted. to form a pumping elel iao 

